🚀 JavaScript Mastery — 6 Week Complete Guide (2025 Edition)

Welcome to the ultimate JavaScript mastery repository — a complete 6-week transformation system designed to take you from intermediate → advanced using a structured, realistic, and deeply technical learning plan.

This is NOT just a roadmap. This is a full guided experience with:

• explanations
• diagrams
• code snippets
• practice problems
• weekly revision
• real-world examples
• and a proven day-by-day structure

Whether you’re refreshing your knowledge or leveling up to senior-level JavaScript, this guide gives you everything you need — clearly, cleanly, and with purpose.

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📌 What’s Inside

✔️ Deep Explanations

Breakdowns, mental models, intuition-building insights. Not “do this”, but why this works.

✔️ Daily 6-Week Study Plan

Every day has:

• 1 main topic
• 1 sub-topic
• examples
• and practice tasks

✔️ Real-World Context

Each concept is connected to how it’s used in:

• frontend apps
• backend apps
• performance work
• architecture decisions

✔️ 300+ Practice Problems

• 100 Easy
• 120 Medium
• 80 Hard

Taken from real-world technical interviews.

✔️ Visual Notes

Short, clean, diagram-style notes for revision.

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📅 6-Week JavaScript Mastery Plan

Here is the clean, scannable version of the full plan:

📌 Week-by-Week Overview

Week	Theme	Key Topics
Week 1	🌱 Foundations	Variables, Hoisting, Scope, Closures, Functions, this, Prototype basics
Week 2	⚡ Async Core	Event Loop, Promises, Async/Await, Propagation, Delegation
Week 3	🧩 Modern JavaScript	Arrays, Advanced Arrays, Spread/Rest, Iterators, Generators, Maps/Sets
Week 4	🧠 Advanced Language Features	Modules, Memory Model, WeakRefs, Classes, Proxies, RegEx
Week 5	🚀 Browser + Performance	Reflow/Repaint, Caching, Memoization, Fetch, Storage APIs
Week 6	🏆 Senior-Level Concepts	Node Event Loop, Workers, Security, Patterns, Concurrency

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🗂️ Detailed Daily Plan

🌱 Week 1 — Foundations

Day	Main Topic	Sub Topic
1	Variables	Hoisting Basics
2	Scope	TDZ
3	Closures	Shadowing
4	Functions	Return Behavior
5	this Keyword	call/apply/bind
6	Prototype Basics	Constructor Functions
7	Revision + Quiz	Practice Day

⚡ Week 2 — Async Core

Day	Main Topic	Sub Topic
8	Inheritance	Object.create
9	Event Loop	Microtask Queue
10	Promises	Promise Combinators
11	Async/Await	Error Handling
12	Event Propagation	Bubbling & Capturing
13	Delegation	Passive Listeners
14	Revision + Quiz	Practice Day

🧩 Week 3 — Modern JavaScript

Day	Main Topic	Sub Topic
15	Arrays Deep	map/filter/reduce
16	Advanced Arrays	toSorted / toSpliced
17	Spread & Rest	Destructuring
18	Iterators	Generator Functions
19	Maps/Sets	Set Operations
20	Symbols	Well-Known Symbols
21	Revision	Practice Day

🧠 Week 4 — Advanced JS

Day	Main Topic	Sub Topic
22	ES Modules	Import Attributes
23	Error Handling	Custom Errors
24	Memory Model	WeakRef + FinalizationRegistry
25	Classes	Static + Private Fields
26	Proxies	Reflect API
27	RegEx	/v Flag + RegExp.escape
28	Revision	Practice Day

🚀 Week 5 — Browser + Performance

Day	Main Topic	Sub Topic
29	Perf Optimization	Debounce + Throttle
30	Caching	Memoization
31	DOM Rendering	Reflow/Repaint
32	Networking	Streams
33	Storage APIs	IndexedDB, Cookies
34	Modern APIs	View Transitions API
35	Revision	Practice Day

🏆 Week 6 — Node + Senior-Level

Day	Main Topic	Sub Topic
36	Node Event Loop	AsyncLocalStorage
37	File System	Buffers + TypedArrays
38	ESM vs CJS	Node Modules
39	Workers	Atomics.waitAsync
40	Security	SRI, Eval Dangers
41	Design Patterns	Observer, Factory
42	Final Review	Mega Test

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🏛️ Project Structure

js-complete-mastery/
│
├── Day-01/
│   ├── Topic-01/
│   │   ├── theory.md
│   │   └── practice/
│   │       ├── easy.md
│   │       ├── medium.md
│   │       └── hard.md
│   │
│   ├── Topic-02/
│   │   ├── theory.md
│   │   └── practice/
│   │       ├── easy.md
│   │       ├── medium.md
│   │       └── hard.md
│
└── README.md

Each day contains maximum 2 topics, each with:

• theory.md — detailed explanation, examples, diagrams
• practice/ — difficulty-based problem sets
  • easy.md
  • medium.md
  • hard.md

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🧠 Practice Problems

Organized into:

/practice
    /easy
    /medium
    /hard

Each file includes:

• explanation
• test cases
• optimal solution
• alternative solution

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🚀 How to Use This Repository

1. Start with theory.md for each topic
2. Attempt practice problems (Easy → Medium → Hard)
3. Move to the next topic/day only after completing all levels

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🤝 Contribute

PRs are welcome! If you want to add explanations, examples, visual notes, or test cases — feel free.

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⭐ Final Words

This repository is a complete learning companion. Whether you revisit one topic per day or binge through full weeks, the goal is simple:

👉 Understand JavaScript deeply — not memorize it. 👉 Build intuition — not surface knowledge. 👉 Become the developer companies love to hire.

Let’s master JavaScript. Step by step. Day by day. Week by week. 🔥